LOL! She's also 2.5 and does these same things. I get to the end of my rope too sometimes, because no matter what I do - she cries or fits.
My theory on this, is that by allowing her freedom of expression (even if I have to take a break now and then) she's going to grow up with a healthy sense of what her emotions ARE and what they feel like and that they are OK to have! Hopefully, at some point, she will learn other ways of expressing herself that are more "socially acceptable".
There are times when I'll ask her to "show mama" (though she's quite verbal and expresses herself very well, sometimes if she's worked up I can't understand a thing) and that helps. I also use distraction a LOT! We sing and dance, which are her favorite things to do, and that usually shifts her mood.
The other thing I believe is that there are just times when she needs to have a physical release of energy! I know how I feel after having a good cry, stomping my feet, slamming a door etc.

This way she's being given the opportunity to express herself without punishment, in a supportive environment. As long as a child isn't being left unconsoled (like CIO techniques where they are shut away or left alone for long periods of time) I don't think that any damage is done.
I also try to remind myself of how I would feel if I were living in a country where I only had rudimentary skills with the language and daily tasks. kwim?
Hugs mama, this too shall pass.
